JP4612397B2 - Multistage straw and its forming apparatus and forming method - Google Patents

Description

  The present invention relates to a beverage multistage straw, a molding method thereof, and a molding apparatus, and more particularly to molding of a stretchable multistage straw stopper.

  Beverage products made of paper containers for beverages or plastic containers combined with lids mainly made of aluminum foil have beverage straws attached to the outer surface to make it easier to drink beverages. In consideration of the space for sticking and the convenience in use, this drinking straw uses a multistage straw that can nest straw blocks having different diameters and extend the entire length.

  FIG. 7 shows a conventional two-stage straw generally attached to a beverage product, in which an inner tube (straw block) 1 and an outer tube (straw block) 2 having different diameters are combined so as to be stretchable. It is a thing. The two-stage straw 9 in this example has a first throttle portion 3 and a second throttle portion 4 formed at both ends of the outer tube 2, and a groove is formed at the tip side between the throttle portions 3 and 4. 5 is formed. Further, an enlarged diameter portion 6 is formed at the proximal end portion of the inner tube 1.

  With such a configuration, when the two-stage straw 9 is used, the enlarged diameter portion 6 is caught by the first throttle portion 3 and the second throttle portion 4 even when the straw is extended, and the inner tube 1 does not come out of the outer tube 2. And once it is stretched, the enlarged diameter portion 6 is caught in the groove 5 so that it does not easily shrink.

As a method for forming such a groove as a stopper, for example, Patent Document 1 describes an example in which a groove as a stopper is formed in parallel with a straw. Patent Document 2 discloses a method in which a straw is rotated to form a circumferential groove all around. Further, Patent Document 3 discloses a method for forming a stopper groove by a rotating tooth mold.
JP-A 61-286114 JP-A-10-99178 JP-A-63-89326

  However, the straw disclosed in Patent Document 1 is not sufficiently effective as a stopper because the base end portion of the inner straw has few portions that are caught in the groove serving as a stopper. For this reason, there was a case where the force applied when the straw was pierced into the beverage pack caused the inner straw to get over the stopper and the inner straw to return to the inside, so that the function as a multistage straw could not be performed.

  Further, in the method for forming a straw disclosed in Patent Document 2, since the forming pin is inserted into the straw and the straw is rotated by the forming pin, there is a concern that the apparatus is not only complicated but also the inside of the straw becomes dirty.

  Furthermore, in the straw molding method disclosed in Patent Document 3, a stopper pin is formed by putting a receiving pin inside the straw and narrowing the rotary tooth mold and the receiving pin, so that the apparatus is not only complicated, but the inside of the straw is dirty. There was a concern. Further, when adjusting the groove depth of the stopper, it is necessary to change the combination of the rotating tooth mold and the receiving pin, which is not suitable for the production of various products. Furthermore, in order to increase the return resistance so that the inner straw does not get over the stopper due to the force applied when the multistage straw is pierced into the beverage pack, the stopper portion is doubled. Although a method of forming a circumferential groove is conceivable, this method increases the return resistance, but the double cylindrical groove may act and bend in the same manner as the bellows straw.

  The present invention has been made in view of such circumstances, and a multistage straw that can be stretched with a small force and that does not easily come off the stopper, and a multistage straw manufacturing apparatus that can be manufactured in a sanitary manner, and An object is to provide a manufacturing method.

  In order to achieve the above object, according to the present invention, a multi-stage straw manufacturing apparatus comprising a plurality of straw blocks having different diameters, the straw blocks being slidably inserted into each other, and the total length being expandable / contractable. The first molding disk and the second molding disk in which a number of semicircular molding blades having an inner diameter smaller than the diameter of the straw block in which the groove-shaped stopper portion is formed are formed, The central axes are parallel to each other and are shifted at a constant interval in the central axis direction, and the molding blade of the first molding disk and the molding blade of the second molding disk face each other and sandwich the straw block. Thus, the multi-stage straw manufacturing apparatus is characterized in that grooves are formed on the circumferential surface of the straw block so as to face each other in a semicircular shape with a predetermined interval in the longitudinal direction of the straw block. .

  The inner diameter of the forming blade only needs to be 10 to 30% smaller than the outer diameter of the straw block. Moreover, the shift | offset | difference of the center axis direction of the shaping | molding blade of a said 1st shaping | molding disk and a said 2nd shaping | molding disk should just be set to the range of 0.2-3.0 mm.

  According to the present invention, the multi-stage straw manufactured by the multi-stage straw manufacturing apparatus is characterized in that the grooves are formed in a semicircular shape facing each other at regular intervals in the longitudinal direction of the straw block. A straw is provided. The grooves may be formed with an interval of 0.2 to 2.0 mm.

  According to the present invention, there is provided a multistage straw manufacturing method comprising a plurality of straw blocks having different diameters, wherein the straw blocks are slidably inserted into each other, and the full length thereof can be expanded and contracted. The first molding disk and the second molding disk, each having a plurality of semicircular molding blades having an inner diameter smaller than the diameter of the straw block formed, are parallel to each other and have a central axis parallel to each other. The first forming disk forming blade and the second forming disk forming blade are opposed to each other and sandwich the straw block so as to sandwich the straw block on the circumferential surface of the straw block. A method for producing a multi-stage straw is provided, wherein the grooves are formed in the longitudinal direction of the straw block so as to be opposed to each other in a semicircular manner with a predetermined interval therebetween.

  According to the present invention, the shape of the groove constituting the stopper of the beverage multistage straw is a semicircular / semicircular circumferential groove, and the resistance when stretching the multistage straw can be reduced. If the tube is rotated, it can be easily stretched by a screw effect, and a sufficient effect as a stopper can be obtained. Furthermore, when getting over the stopper part, it is possible not only to pull and stretch the straw, but also to rotate it by rotating the inner tube, so excessive force is applied when stretching, The fear that the inner straw may pass over the stopper portion and pass through the throttle portion at the tip of the outer straw at the same time can be eliminated.

  Furthermore, according to the multistage straw molding apparatus and molding method of the present invention, continuous molding is possible and there is no need to rotate the straw at the time of molding, so there is no need to put a receiving pin or the like inside the straw, so there is a concern that the inside of the straw will be stained. The multistage straw can be manufactured in a sanitary manner.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. First, the multistage straw manufactured with the manufacturing apparatus of the multistage straw of this invention is shown in FIG. 1 and FIG. A multistage straw (two-stage straw) 10 of the present invention is formed with an outer tube (straw block) 11 and a diameter smaller than the diameter of the outer tube 11, and a part of the inner tube is inserted into the outer tube 11. (Straw block) 12.

  The outer tube 11 has a substantially cylindrical outer shape, and a first throttle portion 13 in which the diameter of the outer tube 11 is narrowed is formed on the distal end side. Further, a second throttle portion 14 in which the diameter of the outer tube 11 is narrowed is also formed on the rear end side of the outer tube 11. The second throttle part 14 side of the outer tube 11 constitutes a suction port for the multistage straw 10. Between these first and second throttle portions 13 and 14, first and second grooves 15 and 16 are formed near the first throttle portion 13.

  The first groove 15 formed near the first throttle portion 13 of the outer tube 11 extends so as to slightly exceed the half circumference of the peripheral surface of the outer tube 11 and is formed so as to protrude inward of the outer tube 11. ing. Further, the second groove 16 extends so as to be slightly beyond the half circumference of the peripheral surface of the outer tube 11 so as to be opposite to the position where the first groove 15 is formed, and protrudes inward of the outer tube 11. Is formed. The first groove 15 and the second groove 16 overlap each other at a portion slightly exceeding the half circumference on the circumference. The depth of the groove of the overlapping portion is shallower than the other portions, and the depth becomes shallower as it goes to the end of the groove, and finally the depth of the groove becomes zero. The depth of the non-overlapping groove is almost constant. Moreover, since the shape of a groove | channel is made into the shape where the straw front-end | tip part side is the deepest as shown in FIG. 2, as shown to FIG. 3A, the enlarged diameter part 18 of the inner tube 12 can be easily latched. preferable.

  The distance t (see FIG. 2) between the first groove 15 and the second groove 16 is, for example, 0.2 to 2.0 mm in the longitudinal direction of the outer tube, and the outer tube so as to face each other. Each of the 11 circumferential surfaces is formed so as to extend for a length of approximately half a circumference. If the distance t between the first groove 15 and the second groove 16 is less than 0.2 mm, the screw effect described later may not be sufficiently exhibited, and if it exceeds 2.0 mm, the effect as a stopper may be insufficient. Such first groove 15 and second groove 16 prevent the return of the enlarged diameter portion 18 of the inner tube 12 described later.

  The outer shape of the inner tube 12 is formed in a substantially cylindrical shape, and a sharpened portion 17 having a sharpened tip is formed on one end side thereof. The sharpened portion 17 plays a role of penetrating a thin film such as a film that closes the straw insertion port of the beverage container. An enlarged diameter portion 18 is formed on the other end side of the inner tube 12. The enlarged diameter portion 18 of the inner tube 12 has a shape such as a trumpet shape or a trumpet-shaped tip further straight. However, the enlarged diameter portion 18 in the present invention is formed outward from the peripheral surface of the inner tube 12. A projecting ring-shaped protrusion is preferred. The thickness of the elongated portion 18 in the longitudinal direction of the straw is preferably, for example, 0.1 to 2.0 mm, and more preferably 0.2 to 1.0 mm. By making the enlarged diameter portion 18 of the inner tube 12 into a flange shape formed of a ring-shaped protrusion, when the inner tube 12 of the multistage straw 10 is stretched while being rotated, the first groove 15 and the second groove 15 of the outer tube 11 are expanded. It becomes easy to get over the shallow part of the groove at the end of the groove 16, and it can be easily stretched so that the screw is rotated and pulled out. The expanded portion 18 is locked as shown in FIG. 3A in the extended state of the multistage straw 10, and is prevented from being contracted by the first groove 15 and the second groove 16 of the outer tube 11.

  The operation of the multistage straw of the present invention having the above configuration will be described. When the multistage straw 10 of the present invention is used, the inner pipe 12 is pulled out from the outer pipe 11 and used in a state where the overall length of the multistage straw 10 is increased. Thereby, when the multistage straw 10 is inserted into a beverage container containing beverages, it becomes easy to suck the beverage.

  In the multistage straw 10 of the present invention, when the inner tube 12 is drawn out from the outer tube 11, as shown in FIG. 3A, the first groove 15 projecting inside the outer tube 11 and the peripheral surface of the inner tube 12 are used. The inner tube 12 drawn out with respect to the outer tube 11 is locked by the engagement with the enlarged diameter portion 18 projecting outward.

  The shape of the first groove 15 and the second groove 16 is the deepest shape on the outer straw tip side, and the inner portion having the groove is provided by providing a common portion on the circumference where the first groove 15 and the second groove 16 gradually become shallower. Without lowering the return prevention effect of the tube 12, it is possible to reduce the resistance during stretching, and to increase the screw effect. The screw effect does not have the same effect as a screw because the grooves are not connected in a spiral shape, but a propulsive force like a screw is expected by rotating the inner straw, and by rotating the inner straw while pulling, This is an effect that the straw can be stretched easily. As shown in FIG. 3B, even if a force is applied to the outer tube 11 to return the inner tube 12 in the storing direction, the first groove 15 protruding to the inner side of the outer tube 11 bends, so that the second groove The expanded diameter portion 18 hits 16 and the inner tube 12 is prevented from returning and contracting into the outer tube 11. As a result, when the multistage straw 10 is used, the inner pipe 12 returns to the storage direction with respect to the outer pipe 11 when the inner pipe 12 is pulled out from the outer pipe 11 and the multistage straw 10 is inserted into the insertion port of the beverage container. Even if a force to be applied is applied, the stretched multistage straw 10 does not contract again. As is clear from FIGS. 3A and 3B, the first groove 15 and the second groove 16 are stepped, and before the enlarged diameter portion 18 deforms and climbs over one groove, it comes into contact with the other groove. Therefore, the stopper effect is equivalent to that provided with grooves (stoppers) on the entire circumference.

  FIG. 4 is an external view showing a beverage product provided with such a multistage straw 10. The multistage straw 10 is affixed, for example, obliquely to the side surface of the beverage container 23 constituting the beverage product 22 in a state of being wrapped in a packaging film 21 that protects the multistage straw 10 from dust or the like. When drinking, the consumer breaks a part of the packaging film 21 to take out the multi-stage straw 10, stretches the multi-stage straw 10, and then inserts the multi-stage straw 10 into the insertion port 24 formed on the upper surface of the beverage container 23. Suction.

  Next, the multistage straw manufacturing apparatus and method for manufacturing the multistage straw of the present invention as described above will be described. 5 and 6 are cross-sectional views showing the main part of the multistage straw manufacturing apparatus of the present invention. The multistage straw manufacturing apparatus 31 for forming the stopper portion is to form the first groove 15 and the second groove 16 in the outer tube 11 of the multistage straw 10 shown in FIG. A first shaping disk 32, and a rotatable substantially circular second shaping disk 33 disposed at a position shifted in the left-right direction M in FIG. 6 at a fixed interval with respect to the first shaping disk 32. It has.

  In the first molding disk 32, a large number of semicircular molding blades 34 having an inner diameter smaller than the outer diameter of the outer tube 11 are formed on the circumference. Similarly, a large number of semicircular forming blades 35 having an inner diameter smaller than the diameter of the outer tube 11 are formed on the second forming disk 33 on the circumference. The diameter r which is the inner diameter of the forming blades 34 and 35 is preferably 10 to 30% smaller than the diameter R of the outer tube 11. Thus, by sandwiching the outer tube 11 of the multistage straw 10 with the molding blades 34 and 35 having an inner diameter smaller than the diameter of the outer tube 11 that is shifted from each other, the first groove 15 and the second groove are formed in the outer tube 11. 16 are formed. The forming blades 34 and 35 have a portion where about half of the circumference of each straw tube is sandwiched and the outside thereof (outside of the line indicated by r in FIG. 5), the straw is easy to enter and escape so as to be easily removed. There are corners. Thereby, the groove cut into the straw becomes gradually deeper from the end. Further, the forming blades 34 and 35 are preferably formed by deepening the straw tip end side as shown in FIG. 6 so that a deep groove can be obtained on the straw tip end side.

  The first molding disk 32 and the second molding disk 33 are preferably arranged, for example, parallel to the central axis passing through the centers of both molding disks and separated by 0.2 to 3.0 mm in the central axis direction. The first molding disk 32 and the second molding disk 33 may be at room temperature, but may be provided with a heating device capable of heating up to about 200 ° C. The multistage straw manufacturing apparatus 31 further includes a supply device (not shown) that holds and supplies a straw block (outer tube) between the first molding disk 32 and the second molding disk 33. It is preferable. As shown in FIG. 5, there are a method of moving the straw horizontally between the forming disks and a method of moving the straw in the circumferential direction. It is preferable because the depth of the groove can be easily adjusted by adjusting the interval between the forming disks in the vertical direction in FIG. 5.

  When the first groove 15 and the second groove 16 are formed in the outer tube 11 of the multistage straw with such a multistage straw manufacturing apparatus 31, the first tube 15 is set while the outer tube 11 is set between the forming blades 34 and 35. The forming disk 32 and the second forming disk 33 are rotated. At this time, the first molding disk 32 and the second molding disk 33 may be heated. Then, in the process in which the outer tube 11 is sandwiched between the molding blades 34 and 35, the molding blade 34 of the first molding disk 32 has the first groove 15, and the molding blade 35 of the second molding disk 33 has the second groove. 16 are formed in the outer tube 11, respectively.

The present applicant verified the characteristics of the multistage straw produced by the multistage straw production apparatus of the present invention. The following samples were prepared for verification.
(Example)
1. A polypropylene outer tube (outer diameter 6.0 mm) with a thickness of 0.25 mm is used, and a forming disk having a structure shown in FIG. And heated to 130 ° C. The speed was 800 pieces / minute, and a groove having a depth of 0.3 mm could be provided in the circumferential direction. 8A and 8B are cross-sectional views of the outer tube near the groove. 8A and 8B are a cross-sectional view taken along line II and II-II in FIG. 3A, respectively. The distance between the upper groove and the lower groove was 0.3 mm in the longitudinal direction of the outer tube.
2. At a speed of 1000 lines / minute, when heated to 150 ° C., a groove having a depth of 0.3 mm could be provided.
3. A polypropylene outer tube (outer diameter 5.0 mm) with a thickness of 0.25 mm is used, and a gear having the structure shown in FIG. And heated to 130 ° C. The speed was 800 pieces / minute, and a groove having a depth of 0.25 mm could be provided in the circumferential direction. The distance between the upper groove and the lower groove was 0.3 mm in the longitudinal direction of the outer tube.

(Comparative example)
1. An outer tube made of polypropylene (outer diameter 6.0 mm) having a thickness of 0.25 mm and having a stopper portion formed of a groove having a depth of 0.3 mm and a length of 4 mm in parallel. FIG. 9 shows a cross-sectional view of the stopper portion.
2. An outer tube made of polypropylene (outer diameter 6.0 mm) having a thickness of 0.25 mm and having a stopper portion comprising a groove having a depth of 0.3 mm on a continuous circumference. FIG. 10 shows a cross-sectional view of the stopper portion.

  Using the outer tubes of the two-stage straws of the example and the comparative example as described above, the return resistance and the ease of stretching were verified. The verification results are shown in Table 1. The return resistance value is measured by preparing a stretched straw, fixing the inner straw (inner tube) and outer straw (outer tube), moving the outer straw so that the interval is narrowed at a constant speed, and stopping the stopper. The maximum load when overcoming was read. The moving speed when measuring the stretching resistance value and the return resistance value was 100 mm / min. When the outer tube of the outer straw has an outer diameter of 6.0 mm, the inner straw used was an outer diameter of 4.5 mm, a flange-shaped expanded portion outer diameter of 5.2 mm, and the expanded portion of the inner straw in the longitudinal direction. An inner straw having a thickness of 0.2 mm. When the outer tube of the outer straw has an outer diameter of 5.0 mm, the inner straw used is 3.8 mm in outer diameter, 4.4 mm in outer diameter of the flange-shaped expanded portion and the inner straw in the longitudinal direction of the expanded portion. An inner straw having a thickness of 0.2 mm.

  According to the verification results shown in Table 1, it is confirmed that the multistage straw of the present invention example can maintain a large return resistance without being inferior to the conventional multistage straw, and the ease of stretching is improved. It was.

It is a perspective view which shows the multistage straw of this invention. It is sectional drawing which shows the multistage straw of this invention. It is explanatory drawing which shows the effect | action of a multistage straw. It is a perspective view which shows the drink product provided with the multistage straw of this invention. It is sectional drawing which shows the shaping | molding apparatus of the multistage straw of this invention. It is sectional drawing which shows the shaping | molding apparatus of the multistage straw of this invention. It is sectional drawing which shows the conventional multistage straw. It is outer tube sectional drawing of the groove | channel vicinity in an Example. It is sectional drawing of the stopper part in a comparative example. It is sectional drawing of the stopper part in a comparative example.

Explanation of symbols

10 .... multi-stage straw, 11 .... outer tube, 12 .... inner tube, 15 .... first groove, 16 .... second groove, 31 ... multi-stage straw manufacturing equipment, 32 ... first molding disk, 33 ..Second molding disk, 34, 35

Claims (6)

A multi-stage straw manufacturing apparatus comprising a plurality of straw blocks having different diameters, wherein the straw blocks are slidably inserted into each other, and the overall length is expandable and contractible.
The first molding disk and the second molding disk each having a plurality of semicircular molding blades having an inner diameter smaller than the diameter of the straw block in which the groove-shaped stopper portion is formed are mutually connected with the central axes thereof. The straws are arranged parallel to each other at a constant interval in the central axis direction, and the straw blade is sandwiched between the molding blade of the first molding disk and the molding blade of the second molding disk facing each other. An apparatus for producing a multistage straw, wherein grooves are formed on a circumferential surface of the block so as to face each other in a semicircular shape with a predetermined interval in the longitudinal direction of the straw block.   The multistage straw manufacturing apparatus according to claim 1, wherein an inner diameter of the forming blade is 10 to 30% smaller than an outer diameter of the straw block.   3. The multistage straw according to claim 1, wherein a deviation in a central axis direction between the forming blade of the first forming disk and the second forming disk is in a range of 0.2 to 3.0 mm. Manufacturing equipment.   A groove formed by the multistage straw manufacturing apparatus according to any one of claims 1 to 3 is formed so as to face each other in a semicircular shape at regular intervals in the longitudinal direction of the straw block. Multi-stage straw characterized by that.   The multistage straw according to claim 4, wherein the grooves are formed with an interval of 0.2 to 2.0 mm. It is composed of a plurality of straw blocks having different diameters from each other, these straw blocks are slidably inserted into each other, and a multistage straw manufacturing method in which the overall length can be expanded and contracted,
The first molding disk and the second molding disk each having a plurality of semicircular molding blades having an inner diameter smaller than the diameter of the straw block in which the groove-shaped stopper portion is formed are mutually connected with the central axes thereof. The straws are arranged parallel to each other at a constant interval in the central axis direction, and the straw blade is sandwiched between the molding blade of the first molding disk and the molding blade of the second molding disk facing each other. A method for producing a multistage straw, characterized in that grooves are formed on the circumferential surface of the block so as to face each other in a semicircular shape with a predetermined interval in the longitudinal direction of the straw block.

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